This mod introduces new compactification technologies to allow you to compact multiple furnaces into one. These technologies provide you with new versions of existing furnaces which are faster and more durable then their regular counterparts. The speed of these furnaces can be adjusted using a mod setting. By default it's 4, but can be turned up all the way to 256 times the speed of a regular furnace.

How is this possible? with mods I have no idea...

Recently re-re-written for 2.0.